Question

我是android编程的新手。在这段代码中，我有一个按钮，当我按下按钮时，屏幕应该关闭。任何人都可以帮我这个代码吗？

当我按下按钮时，即使我将其释放，也没有执行任何操作并且屏幕已开启。

我在清单文件中使用了以下权限，如下所示

uses-permission android:name="android.permission.WAKE_LOCK"

protected static final String TAG = null;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);
    Button powerButton = (Button) findViewById(R.id.powerButton);
    final PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
    final PowerManager.WakeLock wakeLock = powerManager.newWakeLock(
            PowerManager.PARTIAL_WAKE_LOCK, "powerButton");

    powerButton.setOnClickListener(new View.OnClickListener() {

        @SuppressLint("Wakelock")
        public void onClick(View v) {
            try {
                if (wakeLock != null) {
                    Log.d(TAG, "Acquire full screen wake lock.");
                    wakeLock.acquire();

                }
                if (powerManager.isScreenOn()) {
                    Log.d("TAG", "Wakelock successfully acquired");

                } else {
                    Log.d("TAG", "Wackelock not acquired");
                }

                if (wakeLock.isHeld()) {
                    wakeLock.release();
                    Log.d("TAG", "wakelock released sucessfully");
                }

            } catch (Exception e) {
                e.printStackTrace();
                Log.e("onClick", e.getMessage());
            }

        }

    });

}
}

请帮帮我。

提前感谢你。

Answer 1

这是一个Sample，可以在按钮点击时关闭屏幕。该操作发生在mButtonStopListener

public class Main extends Activity {
        private SensorManager mSensorManager;
        private PowerManager mPowerManager;
        private WindowManager mWindowManager;
        private WakeLock mWakeLock;
        private Button button;
        private TextView textView;

        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
try{
            // Get an instance of the SensorManager
            mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

            // Get an instance of the PowerManager
            mPowerManager = (PowerManager) getSystemService(POWER_SERVICE);

            // Get an instance of the WindowManager
            mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
            mWindowManager.getDefaultDisplay();

            // Create a bright wake lock
            mWakeLock = mPowerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, getClass()
                    .getName());

            setContentView(R.layout.main);
            textView = (TextView)findViewById(R.id.textView1);
            button = (Button)findViewById(R.id.button1);
            button.setOnClickListener(mButtonStopListener);


        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Log.e("onCreate", e.getMessage());
        }
} // END onCreate

        View.OnClickListener mButtonStopListener = new OnClickListener() {
            public void onClick(View v) {
                try {
                    mWakeLock.release();
                    textView.setText("mWakeLock.release()");
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    Log.e("onPause",e.getMessage());
                }

            }
        };

        @Override
        protected void onResume() {
            super.onResume();
            /*
             * when the activity is resumed, we acquire a wake-lock so that the
             * screen stays on, since the user will likely not be fiddling with the
             * screen or buttons.
             */

            try {
                mWakeLock.acquire();
                textView.setText("mWakeLock.acquire()");
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Log.e("onResume", e.getMessage());
            }

        }

        @Override
        protected void onPause() {
            super.onPause();

            // and release our wake-lock
            try {
                mWakeLock.release();
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Log.e("onPause",e.getMessage());
            }
        }
}

确保包含

<uses-permission android:name="android.permission.HARDWARE_TEST"></uses-permission>
<uses-permission android:name="android.permission.VIBRATE"></uses-permission>    
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>

这应该从API级别7＆amp;起来。

Answer 2

在您从onClick释放手指之前，不会调用powerButton回调方法。因此，当您按下按钮时，没有执行任何操作。

使用电源管理器关闭屏幕

2 个答案: